package com.levy.contronller.javaWeb.webservice.client.DomForWeatherTest;

import java.io.InputStream;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.URL;
import java.net.URLConnection;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

public class DomWeatherTest {
    /**
     * 获取SOAP的请求头，并替换其中的标志符号为用户输入的城市
     * <p>
     * 编写者：王景辉
     *
     * @param city 用户输入的城市名称
     * @return 客户将要发送给服务器的SOAP请求
     */
    private static String getSoapRequest(String city) {
        StringBuilder sb = new StringBuilder();
        sb
                .append("<?xml version=\"1.0\" encoding=\"utf-8\"?>"
                        + "<soap:Envelope xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" "
                        + "xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" "
                        + "xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\">"
                        + "<soap:Body>    <getWeatherbyCityName xmlns=\"http://WebXml.com.cn/\">"
                        + "<theCityName>" + city
                        + "</theCityName>    </getWeatherbyCityName>"
                        + "</soap:Body></soap:Envelope>");
        return sb.toString();
    }

    /**
     * 用户把SOAP请求发送给服务器端，并返回服务器点返回的输入流
     * <p>
     * 编写者：王景辉
     *
     * @param city 用户输入的城市名称
     * @return 服务器端返回的输入流，供客户端读取
     * @throws Exception
     */
    private static InputStream getSoapInputStream(String city) throws Exception {
        try {
            String soap = getSoapRequest(city);
            if (soap == null) {
                return null;
            }
            URL url = new URL(
                    "http://www.webxml.com.cn/WebServices/WeatherWebService.asmx");
            URLConnection conn = url.openConnection();
            conn.setUseCaches(false);
            conn.setDoInput(true);
            conn.setDoOutput(true);

            conn.setRequestProperty("Content-Length", Integer.toString(soap
                    .length()));
            conn.setRequestProperty("Content-Type", "text/xml; charset=utf-8");
            conn.setRequestProperty("SOAPAction",
                    "http://WebXml.com.cn/getWeatherbyCityName");

            OutputStream os = conn.getOutputStream();
            OutputStreamWriter osw = new OutputStreamWriter(os, "utf-8");
            osw.write(soap);
            osw.flush();
            osw.close();

            InputStream is = conn.getInputStream();
            return is;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * 对服务器端返回的XML进行解析
     * <p>
     * 编写者：王景辉
     *
     * @param city 用户输入的城市名称
     * @return 字符串 用,分割
     */
    public static String getWeather(String city) {
        try {
            Document doc;
            DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
            dbf.setNamespaceAware(true);
            DocumentBuilder db = dbf.newDocumentBuilder();
            InputStream is = getSoapInputStream(city);
            doc = db.parse(is);
            NodeList nl = doc.getElementsByTagName("string");
            StringBuffer sb = new StringBuffer();
            for (int count = 0; count < nl.getLength(); count++) {
                Node n = nl.item(count);
                if (n.getFirstChild().getNodeValue().equals("查询结果为空！")) {
                    sb = new StringBuffer("#");
                    break;
                }
                sb.append(n.getFirstChild().getNodeValue() + "#\n");
            }
            is.close();
            return sb.toString();
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * 测试用
     *
     * @param args
     * @throws Exception
     */
    public static void main(String[] args) throws Exception {
        System.out.println(getWeather("长沙"));
        System.out.println("po&oi".split("&").length);
        System.out.println("##".split("#").length);
    }
}
